Yeah. Most likely this is a sending unit. The way to confirm this is to check the voltage coming from the sender.
https://www.2carpros.com/articles/how-to-check-wiring
Basically, if you monitor it while the key is on, and you are putting fuel in the tank from just a gas can you should see the voltage change.
My guess is it will not and that means the gauge is just showing what the sender is telling it and replace the sender.
Unfortunately, the manual does not have much info on this, but I attached what it does have.
Images (Click to make bigger)
Thursday, January 13th, 2022 AT 4:57 PM